Optically, there are only two versions of the lens: the
18-55mm AL and the
18-55mm AL II. The II launched in 2008, so just check if there's a "II" designation in red on your K100's lens. If not, then you still have the original.
The
DAL and
DA WR versions (which are the only ones currently being produced) are optically identical to the II, which is significantly better than the original.
Adam
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